Bur or washer.



F. E. & P. DE F. WARNER.

' BUR 0R WASHER.

APPLICATION FILED JULY 19, 1915.

1,179,585. Patented Apr. 18, 1916.

FRANK E. WARNER AND PERCY DE F. WARNER, 0F WATERIBURY, CONNECTICUT, ASSIGNORS TO SCOVILL MANUFACTURING COMPANY, OF WATERIBURY, CON- CONNECTICUT, A CORPORATION OF CONNECTICUT.

BUR OR WASHER.

Specification of Letters Patent.

Patented Apr. 18, 1916.

Application filed July 19, 1915. Serial No. 40,709.

To all whom it may concern Be it known that we, FRANK E. WARNER and PERCY DE F. WARNER, citizens of the United States, residing at Waterbury, .in the county of New Haven and State of Connecticut, have invented a certain new and useful Improvement in Burs or Washers, of which the following is a full, clear, and exact description.

There is more or less insistent demand, in various parts of the country, in the overalls trade, for garments having the joints riveted, with the upset end of the rivet clenched over a bur or washer in a more or less symmetrical manner. Aside from the holding strength of the rivet, its appearance seems to have some influence on the purchasers. But it is not always easy to make the clenched end of a rivet symmetrical and attractive. This clenched end of the rivet stands more or less conspicuously above the bur or washer without being obstructive or otherwise in the way. This outstanding clenched end is not always uniform in construction or appearance The object of our invention is to provide a cupped or capped bur in which the leading end of the rivet is clenched, concealed and anchored in such way that the external end of the riveted device as seen will always present a uniform symmetrical appearance.

The invention consists in a bur drawn up from a suitable blank essentially as an eyelet is drawn, the cupped portion being left intact and constricted, as by knurling at its base next to the flange, and this knurled cupped portion then closed down or flattened so as to reduce its height and reduce the diameter of its tack entrance and otherwise collapse this cupped portion so as to simulate the clenched end of a hand or a machine-clenched rivet, the cupped, capped or closed-end bur receiving within it the point of the rivet and admitting of such point being upset, clenched 0r riveted within it and serving as well to anchor the clenched end of the rivet and to conceal and inclose it, all as we will proceed now to explain and finally claim.

The process of making burs herein disclosed is divided out of this case in accordance with the requirement of the Patent Oflice, and forms the subject of our case filed October 1, 1915, Serial No. 53,576.

In the accompanying drawings illustrating the invention, in the several figures of which like parts are similarly designated, Flgure 1 is a plan view and Fig. 2 is a crosssection of the blank. Fig. 3 is a plan view and Fig. A is a cross-section representing the final drawing step by which the blank of Figs. 1 and 2 is converted into a cupped blank. Fig. 5 is a plan view and Fig. 6 is a cross-section of the knurled cupped blank. Fig. 7 is a plan view, Fig. 8 is a cross-section and Fig. 9 is a side elevation of the finished bur. Fig. 10 is a plan view of enough of the machine to illustrate the knurling step, and Fig. 11 is a cross-section on the line A B of Fig. 10, and on a larger scale. Fig. 12 is a partial elevation and cross-section of the dies for closing down or reducing the cupped and knurled bur. Fig. 13 is a cross-section showing a tack set with the bur upon pieces of fabric.

The word knurled and its derivatives are used in the shops to express a spinning operation and are to be so understood here.

The blank, 1, may be of copper or other suitable ductile metal, and it is drawn into cupped form in any suitable way, substantially as eyelets are drawn, for example, so as to produce the cupped device 2, substantially as shown in Figs. 3 and 4. This cupped device comprises the elongated hollow portion or cup 3 and the flange 4. This thus cupped blank is then passed through a machine, comprising essentially a rotary die 5 and a stationary complemental die member or matrix 6, the adjacent faces of which are grooved and beaded substantially as shown in Fig. 11, to grip the hollow portion 3 of the blank just above the flange 4L and reduce it or constrict it externally and internally, and then the thus knurled blank is transferred to the reducing dies 7, 8, in which the hollow portion is flattened, that is to say, its height is reduced and it is somewhat laterally extended, and its center depressed, as shown at 9, whereby to simulate the end of a rivet clenched or set by a hand tool or machine, and its mouth 10 is reduced in diameter so as to afiord an opening only large enough for the entrance of the tack ing exposed, it will be upset and concealed.

within the bur, and thus a uniform symmetrieal and unobtrusive and unobstructive finish will. be given to the riveting;

" ,VVhil'e we have shownthe. preferred form of bur and described the preferred method of producing the bur, which method orprocess forms'the' subject of the divisional case hereinabove referred to, yet it is to be understood that we deem the principle of'our invention as herein claimed, susceptible of variations. e

1. A; bur for rivets, having a hollow portion for inclosing and concealing'the end of the rivetv when upset therein, and a laterally Gopies of this patent"- maybe obtained'forfive cents each, by addressing the-flcom' nissioner 'of Patents,

extending flange, said hollowportion cir- .cumferentially constricted next to the t flange and flattened down.into close proxy to t e ngethe e al displac transversely by the constriction and flattening down of the hollow portion serving to reduce-thediameter ofthe entranceto the cupand thereby leave only room enough for theentrance of the rivet point and affording anchorage for the point of the. rivet when upset within the bur.

2.. A burifon'ri-vets, having a cupped porerally extending flange, said cupped portion constricted at itsibase next toitheflange and flattened down and thereby contracting the entrance intovthe hollow-portion, the top of the cup being provid'edwwith a central de- 945 pression. r

In testimony whereof we have hereunto set our hands this 16th day or July D.

FRANK E. WARNER. PERCY DE F. WARNER. Witnesses: a v

E. A; HYDE, G; FL Homes.

Washington, D. c. I,

tion fortinclosing the rivet-end, and a lat- 40 

